Extinction: How Life On Earth Nearly Ended 250 Million Years Ago

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ExtinctionHow Life On Earth Nearly Ended 250 Million Years Ago

By: Douglas H Erwin

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Some 250 million years ago, the earth suffered the greatest biological crisis in its history. Around 95% of all living species died out--a global catastrophe far greater than the dinosaurs' demise 65 million years ago. How this happened remains a mystery. But there are many competing theories. Some blame huge volcanic eruptions that covered an area as large as the continental United States; others argue for sudden changes in ocean levels and chemistry, including burps of methane gas; and still others cite the impact of an extraterrestrial object, similar to what caused the dinosaurs' extinction.

Publication Date:

10/11/2005

Number of Pages::

296

Binding:

Hard Back

ISBN:

9780691005249

Categories:

RP - Current Affairs

Books

Politics & Current Affairs